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Method for measuring instantaneous three-dimensional soil air permeability and measuring device

A technology of soil air conductivity and testing device, which is applied in the field of transient three-dimensional soil air conductivity measurement method and testing device, which can solve problems such as human disturbance, affecting measurement accuracy and reliability, and achieve easy operation and outstanding substantive features , The effect of simple system structure

Inactive Publication Date: 2012-01-18
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention mainly solves the problems of the existing one-dimensional measurement under the transient method, and the artificial disturbance brought by the soil taking, which affects the measurement accuracy and reliability, etc.

Method used

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  • Method for measuring instantaneous three-dimensional soil air permeability and measuring device
  • Method for measuring instantaneous three-dimensional soil air permeability and measuring device
  • Method for measuring instantaneous three-dimensional soil air permeability and measuring device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1, see figure 1 , taking the air supply part as an air pump and the barometer part as a U-shaped tube pressure gauge as an example, choose an air pump 1 according to the design requirements, and the air pump 1 is equipped with a switch valve 3 and a valve 2; the design is made of stainless steel Standard cylindrical measuring tube 8, rubber stopper 7 is installed on the cylindrical measuring tube 8, the rubber stopper 7 is equipped with an air guide tube 6, and the air guide tube 6 is connected to the tee 5 through the first connecting hose 4; The air valve 2 is connected to a branch of the tee 5 on the measuring tube through the second connecting hose 11, and then one end of the U-shaped air pressure gauge 9 is connected to the tee 5 on the measuring tube through the third connecting hose 12. Another branch pipe is connected, and each connecting part is sealed airtight to form a transient three-dimensional soil air permeability testing device of the present inv...

Embodiment 2

[0020] Embodiment 2 adopts the device of above-mentioned embodiment 1, the difference is that the barometer part adopts a pressure gauge, selects a certain point 10 to be measured, and a cylindrical measuring tube whose diameter is D and whose height is H is vertically driven into the ground for a certain period of time. At the depth h, a part of the measuring pipe (H-h) is above the ground, generally 10-20cm, try to keep the soil undisturbed during the drilling process; connect a branch of the tee on the rubber stopper with the pressure gauge and ensure that the connection It is airtight and air-tight; use an air pump to continuously supply gas to the stainless steel measuring tube until the closed gas pressure in the stainless steel measuring tube reaches a predetermined value to stop the gas supply, and at the same time fold the air guiding hose or take other forms to keep the air in the measuring tube The gas will not flow out through the gas guide hose; start timing from t...

Embodiment 3

[0021] Embodiment 3 adopts the device of above-mentioned embodiment 1, selects a certain point 10 to be measured, and a cylindrical measuring tube with a diameter of D and a height of H is vertically driven into a certain depth h underground, and a part of the measuring tube (H-h) Above the ground, generally 10-20cm, try to keep the soil undisturbed during the intrusion process; inject a certain amount of water into the U-shaped tube manometer, check that the joints are not leaking, and use the pump to continuously pump water into the stainless steel gauge. Stop the gas supply until the closed gas pressure in the stainless steel measuring tube reaches a predetermined value, close the valve at the same time, and fold the gas guiding hose at the same time, or take other forms to keep the gas in the measuring tube from passing through the gas guiding soft tube The tube flows out; start timing when the pressure of the gas enclosed in the stainless steel measuring tube reaches a pre...

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Abstract

The invention discloses a method for measuring instantaneous three-dimensional soil air permeability and a measuring device. The device is characterized by comprising an air supply part, a measuring pipe part and an air pressure gauge part, wherein the measuring pipe part comprises a cylindrical measuring pipe (8) which is provided with a rubber stopper (7); the rubber stopper (7) is provided with an air guide pipe (6); the air guide pipe (6) is connected with a tee joint (5); the air supply part is connected with a branch pipe of the tee joint (5) of the measuring pipe part through a hose; the air pressure gauge part is connected with another branch pipe of the tee joint (5) of the measuring pipe part through a hose; and each connecting part is airtight. In the measuring method, an instantaneous three-dimensional soil air permeability measuring method is established on the basis of an equivalent depth principle by analyzing a boundary condition and a computing model for measuring soil stable one-dimensional and three-dimensional air permeability as well as instantaneous one-dimensional air permeability. By adopting the method, the soil air permeability can be measured under instantaneous and three-dimensional conditions, the measuring process of in-situ measurement of field soil air permeability is simplified, and the measuring efficiency is increased.

Description

technical field [0001] The invention relates to the field of soil physics, in particular to a transient three-dimensional soil air conductivity measurement method and a test device. Background technique [0002] Air conductivity is one of the most important parameters in all soil airflow simulations. As early as more than a hundred years ago, air conductivity was regarded as an important characteristic index of soil. Air conductivity is very important in the study of soil structure and structural stability. Important, and there is a close relationship between soil air conductivity and soil saturated hydraulic conductivity, which is often used as a substitute indicator for soil saturated hydraulic conductivity. From the perspective of gas supply, the methods for measuring the air conductivity of porous media (soil, asphalt, concrete, etc.) can be divided into two categories, one is the steady-state airflow measurement method (hereinafter referred to as the steady-state method...

Claims

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Application Information

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IPC IPC(8): G01N7/00
Inventor 张振华杨润亚李陆生牛文全张富仓
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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